10-10-10 is a general purpose fertilizer for all plants, so if you had something close to that it would be just fine. I use a 12-12-12 for my plants about a 1/4 cup per bush. Other than that I most likely wouldn't use it. I don't know anything about farm fertilizer.

If you think you can use 50lb in one year, that's a good price. Even if you don't use 50 lb that's a good price. You can also use a bloom booster if you want to. The higher middle number for bloom booster. You can spread the fertilizer around all your plants that like to be fed.